// ==============================================================
//	This file is part of MegaGlest Shared Library (www.megaglest.org)
//
//	Copyright (C) 2013 Mark Vejvoda
//
//	You can redistribute this code and/or modify it under
//	the terms of the GNU General Public License as published
//	by the Free Software Foundation; either version 2 of the
//	License, or (at your option) any later version
// ==============================================================

// This file is based on example3.c - Demonstrates how to use miniz.c's deflate()
// and inflate() functions for simple file compression.
// Public domain, May 15 2011, Rich Geldreich, richgel99@gmail.com. See "unlicense"
// statement at the end of tinfl.c.
// For simplicity, this example is limited to files smaller than 4GB, but this
// is not a limitation of miniz.c.

#include "compression_utils.h"
#include "miniz/miniz.c"
#include <limits.h>
#include <string>
#include <vector>
#include "conversion.h"
#include "platform_util.h"
#include "util.h"

using namespace Shared::Util;

namespace Shared{ namespace CompressionUtil{

typedef unsigned char uint8;
typedef unsigned short uint16;
typedef unsigned int uint;

#define my_max(a,b) (((a) > (b)) ? (a) : (b))
#define my_min(a,b) (((a) < (b)) ? (a) : (b))

#define BUF_SIZE (1024 * 1024)
static uint8 s_inbuf[BUF_SIZE];
static uint8 s_outbuf[BUF_SIZE];

int zipfile_tool(int argc, const char *argv[]) {
  const char *pMode = NULL;
  FILE *pInfile = NULL,
	   *pOutfile = NULL;
  uint infile_size = 0;
  int level = Z_BEST_COMPRESSION;
  z_stream stream;
  int p = 1;
  const char *pSrc_filename = NULL;
  const char *pDst_filename = NULL;
  long file_loc = 0;

  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("miniz.c version: %s\n", MZ_VERSION);

  if (argc < 4) {
	  if(SystemFlags::VERBOSE_MODE_ENABLED) {
			printf("Usage: example3 [options] [mode:c or d] infile outfile\n");
			printf("\nModes:\n");
			printf("c - Compresses file infile to a zlib stream in file outfile\n");
			printf("d - Decompress zlib stream in file infile to file outfile\n");
			printf("\nOptions:\n");
			printf("-l[0-10] - Compression level, higher values are slower.\n");
	  }
	  return EXIT_FAILURE;
  }

  while ((p < argc) && (argv[p][0] == '-')) {
    switch (argv[p][1]) {
      case 'l':
      {
        level = atoi(&argv[1][2]);
        if ((level < 0) || (level > 10)) {
        	if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Invalid level!\n");
        	return EXIT_FAILURE;
        }
        break;
      }
      default:
      {
    	  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Invalid option: %s\n", argv[p]);
    	  return EXIT_FAILURE;
      }
    }
    p++;
  }

  if ((argc - p) < 3) {
	  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Must specify mode, input filename, and output filename after options!\n");
	  return EXIT_FAILURE;
  }
  else if ((argc - p) > 3) {
	  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Too many filenames!\n");
	  return EXIT_FAILURE;
  }

  pMode = argv[p++];
  if (!strchr("cCdD", pMode[0])) {
	  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Invalid mode!\n");
	  if(SystemFlags::VERBOSE_MODE_ENABLED) return EXIT_FAILURE;
  }

  pSrc_filename = argv[p++];
  pDst_filename = argv[p++];

  if(SystemFlags::VERBOSE_MODE_ENABLED)printf("Mode: %c, Level: %d\nInput File: \"%s\"\nOutput File: \"%s\"\n", pMode[0], level, pSrc_filename, pDst_filename);

  // Open input file.
  pInfile = fopen(pSrc_filename, "rb");
  if (!pInfile) {
	  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Failed opening input file!\n");
	  return EXIT_FAILURE;
  }

  // Determine input file's size.
  fseek(pInfile, 0, SEEK_END);
  file_loc = ftell(pInfile);
  fseek(pInfile, 0, SEEK_SET);

  if ((file_loc < 0) || (file_loc > INT_MAX)) {
     // This is not a limitation of miniz or tinfl, but this example.
	  printf("File is too large to be processed by this example.\n");

	  fclose(pInfile);
      return EXIT_FAILURE;
  }

  infile_size = (uint)file_loc;

  // Open output file.
  pOutfile = fopen(pDst_filename, "wb");
  if (!pOutfile) {
	  printf("Failed opening output file!\n");

	  fclose(pInfile);
	  return EXIT_FAILURE;
  }

  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Input file size: %u\n", infile_size);

  // Init the z_stream
  memset(&stream, 0, sizeof(stream));
  stream.next_in = s_inbuf;
  stream.avail_in = 0;
  stream.next_out = s_outbuf;
  stream.avail_out = BUF_SIZE;

  if ((pMode[0] == 'c') || (pMode[0] == 'C')) {
    // Compression.
    uint infile_remaining = infile_size;

    if (deflateInit(&stream, level) != Z_OK) {
    	if(SystemFlags::VERBOSE_MODE_ENABLED) printf("deflateInit() failed!\n");

    	if(pInfile) fclose(pInfile);
  	    if(pOutfile) fclose(pOutfile);
    	return EXIT_FAILURE;
    }

    for ( ; ; ) {
      int status;
      if (!stream.avail_in) {
        // Input buffer is empty, so read more bytes from input file.
        uint n = my_min(BUF_SIZE, infile_remaining);

        if (fread(s_inbuf, 1, n, pInfile) != n) {
        	if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Failed reading from input file!\n");

        	fclose(pInfile);
      	    if(pOutfile) fclose(pOutfile);
        	return EXIT_FAILURE;
        }

        stream.next_in = s_inbuf;
        stream.avail_in = n;

        infile_remaining -= n;
        //printf("Input bytes remaining: %u\n", infile_remaining);
      }

      status = deflate(&stream, infile_remaining ? Z_NO_FLUSH : Z_FINISH);

      if ((status == Z_STREAM_END) || (!stream.avail_out)) {
        // Output buffer is full, or compression is done, so write buffer to output file.
        uint n = BUF_SIZE - stream.avail_out;
        if (fwrite(s_outbuf, 1, n, pOutfile) != n) {
        	if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Failed writing to output file!\n");

        	if(pInfile) fclose(pInfile);
      	    fclose(pOutfile);
        	return EXIT_FAILURE;
        }
        stream.next_out = s_outbuf;
        stream.avail_out = BUF_SIZE;
      }

      if (status == Z_STREAM_END) {
        break;
      }
      else if (status != Z_OK) {
    	  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("deflate() failed with status %i!\n", status);

    	  if(pInfile) fclose(pInfile);
    	  if(pOutfile) fclose(pOutfile);
    	  return EXIT_FAILURE;
      }
    }

    if (deflateEnd(&stream) != Z_OK) {
    	if(SystemFlags::VERBOSE_MODE_ENABLED) printf("deflateEnd() failed!\n");

    	if(pInfile) fclose(pInfile);
  	    if(pOutfile) fclose(pOutfile);
    	return EXIT_FAILURE;
    }
  }
  else if ((pMode[0] == 'd') || (pMode[0] == 'D')) {
    // Decompression.
    uint infile_remaining = infile_size;

    if (inflateInit(&stream)) {
    	if(SystemFlags::VERBOSE_MODE_ENABLED) printf("inflateInit() failed!\n");

    	if(pInfile) fclose(pInfile);
    	if(pOutfile) fclose(pOutfile);
    	return EXIT_FAILURE;
    }

    for ( ; ; ) {
      int status;
      if (!stream.avail_in) {
        // Input buffer is empty, so read more bytes from input file.
        uint n = my_min(BUF_SIZE, infile_remaining);

        if (fread(s_inbuf, 1, n, pInfile) != n) {
        	if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Failed reading from input file!\n");

        	fclose(pInfile);
        	if(pOutfile) fclose(pOutfile);
        	return EXIT_FAILURE;
        }

        stream.next_in = s_inbuf;
        stream.avail_in = n;

        infile_remaining -= n;
      }

      status = inflate(&stream, Z_SYNC_FLUSH);

      if ((status == Z_STREAM_END) || (!stream.avail_out)) {
        // Output buffer is full, or decompression is done, so write buffer to output file.
        uint n = BUF_SIZE - stream.avail_out;
        if (fwrite(s_outbuf, 1, n, pOutfile) != n) {
        	if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Failed writing to output file!\n");

      	    if(pInfile) fclose(pInfile);
      	    fclose(pOutfile);
        	return EXIT_FAILURE;
        }
        stream.next_out = s_outbuf;
        stream.avail_out = BUF_SIZE;
      }

      if (status == Z_STREAM_END) {
        break;
      }
      else if (status != Z_OK) {
    	  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("inflate() failed with status %i!\n", status);

    	  if(pInfile) fclose(pInfile);
    	  if(pOutfile) fclose(pOutfile);
    	  return EXIT_FAILURE;
      }
    }

    if (inflateEnd(&stream) != Z_OK) {
    	if(SystemFlags::VERBOSE_MODE_ENABLED) printf("inflateEnd() failed!\n");

    	if(pInfile) fclose(pInfile);
  	    if(pOutfile) fclose(pOutfile);
        return EXIT_FAILURE;
    }
  }
  else {
	  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Invalid mode!\n");

	  if(pInfile) fclose(pInfile);
	  if(pOutfile) fclose(pOutfile);
	  return EXIT_FAILURE;
  }

  fclose(pInfile); pInfile = 0;
  if (EOF == fclose(pOutfile)) {
	  if(SystemFlags::VERBOSE_MODE_ENABLED) printf("Failed writing to output file!\n");
	  return EXIT_FAILURE;
  }

  if(SystemFlags::VERBOSE_MODE_ENABLED) {
	  printf("Total input bytes: %u\n", (mz_uint32)stream.total_in);
	  printf("Total output bytes: %u\n", (mz_uint32)stream.total_out);
	  printf("Success.\n");
  }
  return EXIT_SUCCESS;
}

bool compressFileToZIPFile(string inFile, string outFile, int compressionLevel) {
	string options = "-l" + intToStr(compressionLevel);
	std::vector<const char *> argv;
	argv.push_back(options.c_str());
	argv.push_back("c");
	argv.push_back(inFile.c_str());
	argv.push_back(outFile.c_str());

	int result = zipfile_tool((int)argv.size(), &argv[0]);
	return(result == EXIT_SUCCESS ? true : false);
}

bool extractFileFromZIPFile(string inFile, string outFile) {
	std::vector<const char *> argv;
	argv.push_back("-l10");
	argv.push_back("d");
	argv.push_back(inFile.c_str());
	argv.push_back(outFile.c_str());

	int result = zipfile_tool((int)argv.size(), &argv[0]);
	return(result == EXIT_SUCCESS ? true : false);
}

std::pair<unsigned char *,unsigned long> compressMemoryToMemory(unsigned char *input, unsigned long input_len, int compressionLevel) {
	// Like compress() but with more control, level may range from 0 (storing) to 9 (max. compression)
	unsigned long compressed_buffer_len = input_len + 100;
	unsigned char *compressed_buffer = new unsigned char[compressed_buffer_len+1];
	memset(compressed_buffer,0,compressed_buffer_len+1);

	unsigned char *decompressed_buffer = new unsigned char[input_len+1];
	memcpy(decompressed_buffer,input,input_len);

	//printf("compress2 start size: %lu\n",input_len);
	int result = compress2(compressed_buffer, &compressed_buffer_len, decompressed_buffer, input_len, compressionLevel);
	if(result != Z_OK) {
		string msg = string("Invalid compress2 return value: ") + intToStr(result);
		throw megaglest_runtime_error(msg.c_str());
	}

	//printf("compress2 returned: %d start size: %lu end size: %lu\n",result,input_len,compressed_buffer_len);
	delete [] decompressed_buffer;

	return make_pair(compressed_buffer,compressed_buffer_len);
}

std::pair<unsigned char *,unsigned long> extractMemoryToMemory(unsigned char *input, unsigned long input_len, unsigned long max_output_len) {
	// Like compress() but with more control, level may range from 0 (storing) to 9 (max. compression)
	unsigned long decompressed_buffer_len = max_output_len;
	unsigned char *decompressed_buffer = new unsigned char[decompressed_buffer_len+1];
	memset(decompressed_buffer,0,decompressed_buffer_len+1);
	//printf("#1uncompress start size: %lu\n",input_len);

	unsigned char *compressed_buffer = new unsigned char[input_len+1];
	memcpy(compressed_buffer,input,input_len);

	//printf("#2uncompress start size: %lu\n",input_len);
	//int result = uncompress(decompressed_buffer, &decompressed_buffer_len, compressed_buffer, input_len);
	int result = uncompress(decompressed_buffer, &decompressed_buffer_len, compressed_buffer, input_len);
	if(result != Z_OK) {
		string msg = string("Invalid uncompress return value: ") + intToStr(result);
		throw megaglest_runtime_error(msg.c_str());
	}
	//printf("uncompress returned: %d start size: %lu end size: %lu\n",result,input_len,decompressed_buffer_len);
	delete [] compressed_buffer;

	return make_pair(decompressed_buffer,decompressed_buffer_len);
}

}}
